Author

Bibtex

@inproceedings{a82190faac4242308d9ca391a7bf6c17,

title = "Testing of a one dimensional model for Field II calibration",

abstract = "Field II is a program for simulating ultrasound transducer fields. It is capable of calculating the emitted and pulse-echoed fields for both pulsed and continuous wave transducers. To make it fully calibrated a model of the transducer’s electro-mechanical impulse response must be included. We examine an adapted one dimensional transducer model originally proposed by Willatzen [9] to calibrate Field II. This model is modified to calculate the required impulse responses needed by Field II for a calibrated field pressure and external circuit current calculation. The testing has been performed with Pz27 piezoceramic discs from Ferroperm Piezoceramics A/S, Kvistgaard, Denmark. The transmitted acoustic pressures from two sets of each five disc samples with 10.08 mm diameters were measured in an automatic water bath needle hydrophone setup together with the current flow through the driving circuit. Resonance frequencies at 2.1 MHz and 4 MHz were applied. Two types of circuits were considered, one circuit with a simple resistance load of 47.5 Ohm and one with an example of a LR tuning circuit typically found in commercial transducers. The measurements were averaged 128 times and afterwards compared to the calibrated Field II program for 1, 4, and 10 cycle excitations. Two parameter sets were applied for modeling, one real valued Pz27 parameter set, manufacturer supplied, and one complex valued parameter set found in literature, Alguer´o et al. [11]. The latter implicitly accounts for attenuation. Results show that the combination of the model and Field II can calculate the pressure within −15 {\%} to 5 {\%} RMS error for long excitation bursts and 7 {\%} to 23 {\%} for short excitation bursts. Furthermore it is shown that current simulations can be done within 1 {\%} to maximum 33 {\%} RMS error, where best current simulations are found for 4 MHz long burst simulations and worst case is found for 2.1 MHz short bursts. Finally it is shown that maximum pressure deviation for the real parameter set and the complex parameter simulation is 3 {\%} for pressure and 5.3 {\%} for current.",

RIS

TY - GEN

T1 - Testing of a one dimensional model for Field II calibration

AU - Bæk, David

AU - Jensen, Jørgen Arendt

AU - Willatzen, Morten

PY - 2008

Y1 - 2008

N2 - Field II is a program for simulating ultrasound
transducer fields. It is capable of calculating the emitted and
pulse-echoed fields for both pulsed and continuous wave transducers.
To make it fully calibrated a model of the transducer’s
electro-mechanical impulse response must be included.
We examine an adapted one dimensional transducer model
originally proposed by Willatzen [9] to calibrate Field II. This
model is modified to calculate the required impulse responses
needed by Field II for a calibrated field pressure and external
circuit current calculation. The testing has been performed with
Pz27 piezoceramic discs from Ferroperm Piezoceramics A/S,
Kvistgaard, Denmark. The transmitted acoustic pressures from
two sets of each five disc samples with 10.08 mm diameters
were measured in an automatic water bath needle hydrophone
setup together with the current flow through the driving circuit.
Resonance frequencies at 2.1 MHz and 4 MHz were applied.
Two types of circuits were considered, one circuit with a simple
resistance load of 47.5 Ohm
and one with an example of a LR
tuning circuit typically found in commercial transducers. The
measurements were averaged 128 times and afterwards compared
to the calibrated Field II program for 1, 4, and 10 cycle
excitations. Two parameter sets were applied for modeling, one
real valued Pz27 parameter set, manufacturer supplied, and one
complex valued parameter set found in literature, Alguer´o et al.
[11]. The latter implicitly accounts for attenuation. Results show
that the combination of the model and Field II can calculate the
pressure within −15 % to 5 % RMS error for long excitation
bursts and 7 % to 23 % for short excitation bursts. Furthermore
it is shown that current simulations can be done within 1 % to
maximum 33 % RMS error, where best current simulations are
found for 4 MHz long burst simulations and worst case is found
for 2.1 MHz short bursts. Finally it is shown that maximum
pressure deviation for the real parameter set and the complex
parameter simulation is 3 % for pressure and 5.3 % for current.

AB - Field II is a program for simulating ultrasound
transducer fields. It is capable of calculating the emitted and
pulse-echoed fields for both pulsed and continuous wave transducers.
To make it fully calibrated a model of the transducer’s
electro-mechanical impulse response must be included.
We examine an adapted one dimensional transducer model
originally proposed by Willatzen [9] to calibrate Field II. This
model is modified to calculate the required impulse responses
needed by Field II for a calibrated field pressure and external
circuit current calculation. The testing has been performed with
Pz27 piezoceramic discs from Ferroperm Piezoceramics A/S,
Kvistgaard, Denmark. The transmitted acoustic pressures from
two sets of each five disc samples with 10.08 mm diameters
were measured in an automatic water bath needle hydrophone
setup together with the current flow through the driving circuit.
Resonance frequencies at 2.1 MHz and 4 MHz were applied.
Two types of circuits were considered, one circuit with a simple
resistance load of 47.5 Ohm
and one with an example of a LR
tuning circuit typically found in commercial transducers. The
measurements were averaged 128 times and afterwards compared
to the calibrated Field II program for 1, 4, and 10 cycle
excitations. Two parameter sets were applied for modeling, one
real valued Pz27 parameter set, manufacturer supplied, and one
complex valued parameter set found in literature, Alguer´o et al.
[11]. The latter implicitly accounts for attenuation. Results show
that the combination of the model and Field II can calculate the
pressure within −15 % to 5 % RMS error for long excitation
bursts and 7 % to 23 % for short excitation bursts. Furthermore
it is shown that current simulations can be done within 1 % to
maximum 33 % RMS error, where best current simulations are
found for 4 MHz long burst simulations and worst case is found
for 2.1 MHz short bursts. Finally it is shown that maximum
pressure deviation for the real parameter set and the complex
parameter simulation is 3 % for pressure and 5.3 % for current.